CN109285515B

CN109285515B - Pixel signal conversion method and device

Info

Publication number: CN109285515B
Application number: CN201811320177.4A
Authority: CN
Inventors: 康志聪
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2018-11-07
Filing date: 2018-11-07
Publication date: 2020-07-10
Anticipated expiration: 2038-11-07
Also published as: US20210134237A1; WO2020093446A1; US11200857B2; CN109285515A

Abstract

The application relates to a pixel signal conversion method and a pixel signal conversion device, wherein a first stimulus value signal, a second stimulus value signal and a third stimulus value signal are obtained correspondingly according to an initial first sub-pixel signal, an initial second sub-pixel signal and an initial third sub-pixel signal in a pixel signal. Further, gain processing is carried out according to the maximum value and the minimum value in the stimulation value signal set, a fourth sub-pixel signal is obtained according to the minimum value, and the converted first sub-pixel signal, the converted second sub-pixel signal and the converted third sub-pixel signal are obtained. And converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal to be used as converted pixel signals. Therefore, when the converted pixel signals are applied to a color-mixed color display formed by W, R, G, B four-color sub-pixels, the display effect is closer to the actual expression of the original R, G, B color-mixed color, the defect of large-viewing-angle color cast is reduced, and the display effect is improved.

Description

Pixel signal conversion method and device

Technical Field

The present disclosure relates to the field of liquid crystal display technologies, and in particular, to a pixel signal conversion method and device.

Background

In a conventional lcd, three color light sources, which are generally generated by three sub-pixels of R (Red), G (Green), and B (Blue), are mixed to generate a desired display color. The R, G, B three-color light source is formed by R, G, B three sub-pixel absorbing photo resist material absorbing the light band of the sub-pixel units other than R, G and blue, so that R, G, B three sub-pixels generate the corresponding R, G, B three-color light source.

With the improvement of the resolution of the liquid crystal display, the increase of the sub-pixels overlaps the decrease of the aperture ratio of the corresponding pixels of the sub-pixels, which causes the transmittance loss of the high-resolution display and leads to the decrease of the light efficiency. Therefore, to balance the high resolution, transmittance, light efficiency, and backlight architecture cost of liquid crystal displays, mixed color displays have emerged that are constructed with W (White), R, G, B four-color subpixels. The white sub-pixel has no light resistance absorbing material for absorbing visible light energy, so that the transmittance and the light efficiency of the display can be improved.

However, the white sub-pixel has a large transmittance, and color shift is caused by light leakage at a large viewing angle, which affects the quality of the image viewed at the large viewing angle, and the optical characteristics of the lcd viewed at the large viewing angle cannot maintain the same correct color rendering as the lcd viewed at the front viewing angle due to the different transmittance characteristics of the full-wavelength visible light at the front viewing angle and the large viewing angle.

In summary, when a mixed-color display composed of W, R, G, B four-color sub-pixels is driven by R, G, B three-color sub-pixel signals, there is a large viewing angle color shift defect.

Disclosure of Invention

Accordingly, it is desirable to provide a pixel signal conversion method and apparatus for solving the problem of large viewing angle color shift defect when R, G, B three-color sub-pixel signals are used for driving a color mixing color display composed of W, R, G, B four-color sub-pixels.

A pixel signal conversion method, comprising the steps of:

acquiring a pixel signal; the pixel signals comprise an initial first sub-pixel signal, an initial second sub-pixel signal and an initial third sub-pixel signal; the pixel signals are used for correspondingly driving a red sub-pixel, a green sub-pixel and a blue sub-pixel in a specific pixel unit;

obtaining each first stimulus value signal of the initial first sub-pixel signal according to the initial first sub-pixel signal, obtaining each second stimulus value signal of the initial second sub-pixel signal according to the initial second sub-pixel signal, and obtaining each third stimulus value signal of the initial third sub-pixel signal according to the initial third sub-pixel signal;

determining a gain value according to the maximum value and the minimum value in the stimulus value signal set, and respectively performing gain processing on the first stimulus value signal, the second stimulus value signal and the third stimulus value signal according to the gain value; wherein the set of stimulus value signals includes a first stimulus value signal, a second stimulus value signal, and a third stimulus value signal;

obtaining a fourth sub-pixel signal according to the minimum value in the stimulation value signal set after the gain processing;

obtaining a first conversion sub-pixel signal according to the difference value between the first stimulation value signal after any gain processing and the minimum value, obtaining a second conversion sub-pixel signal according to the difference value between the second stimulation value signal after any gain processing and the minimum value, and obtaining a third conversion sub-pixel signal according to the difference value between the third stimulation value signal after any gain processing and the minimum value;

converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal as converted pixel signals; the converted pixel signals are used for correspondingly driving a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel in a specific pixel unit.

In one embodiment, the process of determining the gain value from the maximum and minimum values in the set of stimulus value signals comprises the steps of:

when the maximum value is larger than N times of the minimum value, determining a gain value according to the ratio of the maximum value to the signal difference value, otherwise setting a preset gain value as the gain value; wherein the signal difference is a ratio of the maximum value to the minimum value.

In one embodiment, the process of obtaining the fourth sub-pixel signal according to the minimum value in the set of stimulation value signals after the gain processing comprises the steps of:

and assigning any fourth stimulus value signal as a minimum value according to the relationship between the fourth sub-pixel signal and any fourth stimulus value signal of the fourth sub-pixel signal to obtain a fourth sub-pixel signal.

In one embodiment, the fourth stimulation value signal is a WX stimulation value signal, a WY stimulation value signal, or a WZ stimulation value signal;

any fourth stimulus value signal is a WY stimulus value signal.

In one embodiment, the first stimulation value signal is an RX stimulation value signal, a RY stimulation value signal, or an RZ stimulation value signal;

the second stimulation value signal is a GX stimulation value signal, a GY stimulation value signal or a GZ stimulation value signal;

the third stimulus value signal is a BX stimulus value signal, a BY stimulus value signal or a BZ stimulus value signal.

In one embodiment, the stimulation value signal set includes a gain processed RY stimulation value signal, a gain processed GY stimulation value signal, and a gain processed BY stimulation value signal.

In one embodiment, the set of stimulus value signals includes a gain processed RX stimulus value signal, a gain processed GY stimulus value signal, and a gain processed BZ stimulus value signal.

In one embodiment, the process of obtaining each first stimulus value signal of the initial first sub-pixel signal according to the initial first sub-pixel signal is as follows:

a process of obtaining each second stimulus value signal of the initial second sub-pixel signal according to the initial second sub-pixel signal, as follows:

a process of obtaining each third stimulus value signal of the initial third sub-pixel signal according to the initial third sub-pixel signal, as follows:

wherein, RX is RX stimulation value signal, RY is RY stimulation value signal, RZ is RZ stimulation value signal, and R is initial first sub-pixel signal; GX is a GX stimulus value signal, GY is a GY stimulus value signal, GZ is a GZ stimulus value signal, and G is an initial second sub-pixel signal; BX is a BX stimulus value signal, BY is a BY stimulus value signal, BZ is a BZ stimulus value signal, and B is an initial third sub-pixel signal; t is the maximum value of the pixel signal;

wherein, γ RX, γ RY and γ RZ are the power functions of the stimulus value of the initial first sub-pixel signal; gamma GX, gamma GY and gamma GZ are stimulation value power functions of the initial second sub-pixel signal; gamma BX, gamma BY, and gamma BZ are all power functions of the stimulus value of the initial third subpixel signal.

A pixel signal conversion apparatus comprising:

the pixel signal acquisition module is used for acquiring pixel signals; the pixel signals comprise an initial first sub-pixel signal, an initial second sub-pixel signal and an initial third sub-pixel signal; the pixel signals are used for correspondingly driving a red sub-pixel, a green sub-pixel and a blue sub-pixel in a specific pixel unit;

the signal processing module is used for obtaining each first stimulus value signal of the initial first sub-pixel signal according to the initial first sub-pixel signal, obtaining each second stimulus value signal of the initial second sub-pixel signal according to the initial second sub-pixel signal, and obtaining each third stimulus value signal of the initial third sub-pixel signal according to the initial third sub-pixel signal;

the gain module is used for determining a gain value according to the maximum value and the minimum value in the stimulation value signal set and respectively performing gain processing on the first stimulation value signal, the second stimulation value signal and the third stimulation value signal according to the gain value; wherein the set of stimulus value signals includes a first stimulus value signal, a second stimulus value signal, and a third stimulus value signal;

the white sub-pixel obtaining module is used for obtaining a fourth sub-pixel signal according to the minimum value in the stimulation value signal set after the gain processing;

and the conversion sub-pixel obtaining module is used for obtaining a conversion first sub-pixel signal according to the difference value between the first stimulation value signal after any gain processing and the minimum value, obtaining a conversion second sub-pixel signal according to the difference value between the second stimulation value signal after any gain processing and the minimum value, and obtaining a conversion third sub-pixel signal according to the difference value between the third stimulation value signal after any gain processing and the minimum value.

The signal conversion module is used for converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal to be used as converted pixel signals; the converted pixel signals are used for correspondingly driving a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel in a specific pixel unit.

A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:

A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:

According to the pixel signal conversion method and device, the corresponding first stimulus value signal, second stimulus value signal and third stimulus value signal are obtained according to the initial first sub-pixel signal, the initial second sub-pixel signal and the initial third sub-pixel signal in the pixel signals. And further, performing gain processing on the first stimulus value signal, the second stimulus value signal and the third stimulus value signal according to the maximum value and the minimum value in the stimulus value signal set, obtaining a fourth sub-pixel signal according to the minimum value of the stimulus value signals after the gain processing, and sequentially obtaining a converted first sub-pixel signal, a converted second sub-pixel signal and a converted third sub-pixel signal. And finally, converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal to be used as converted pixel signals. Therefore, when the converted pixel signals are applied to a color-mixed color display formed by W, R, G, B four-color sub-pixels, the display effect is closer to the actual expression of the original R, G, B color-mixed color, the defect of large-viewing-angle color cast is reduced, and the display effect is improved.

Drawings

FIG. 1 is a schematic flow chart illustrating a pixel signal conversion method according to an embodiment;

FIG. 2 is a schematic diagram of a four color display array;

FIG. 3 is a flowchart of a pixel signal conversion method according to another embodiment;

FIG. 4 is a graph illustrating a set of stimulus value signals according to an embodiment;

FIG. 5 is a graph illustrating a stimulation value signal set curve according to another embodiment;

FIG. 6 is a flowchart illustrating a pixel signal conversion method according to yet another embodiment;

fig. 7 is a block diagram of a pixel signal conversion device according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The application provides a pixel signal conversion method, which comprises the following steps:

fig. 1 is a flowchart illustrating a pixel signal conversion method according to an embodiment, and as shown in fig. 1, the pixel signal conversion method includes steps S100 to S105:

s100, acquiring a pixel signal; the pixel signals comprise an initial first sub-pixel signal, an initial second sub-pixel signal and an initial third sub-pixel signal; the pixel signals are used for correspondingly driving a red sub-pixel, a green sub-pixel and a blue sub-pixel in a specific pixel unit;

the first sub-pixel signal may be an R sub-pixel signal, the second sub-pixel signal may be a G sub-pixel signal, the third sub-pixel signal may be a B sub-pixel signal, and the fourth sub-pixel signal may be a W sub-pixel signal.

Fig. 2 is a schematic diagram of a four-color display array, and as shown in fig. 2, the four-color display array includes a plurality of four-color pixel units 200 arranged in rows and columns, and each of the four-color pixel units 200 includes four sub-pixels, namely, a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a W (White) sub-pixel. In a conventional three-color display array, a plurality of three-color pixel units are arranged in rows and columns, and each three-color pixel unit includes three sub-pixels, namely, a red sub-pixel, a green sub-pixel and a blue sub-pixel. The specific pixel unit can be any one of the pixel units in the four-color display array shown in fig. 2. The pixel signals before conversion acquired in step S100 are used to correspondingly drive the red, green and blue sub-pixels in a specific pixel unit, and are used to change the brightness and darkness of the correspondingly driven sub-pixels. Specifically, the initial first subpixel signal drives the red subpixel, the initial second subpixel signal drives the green subpixel, and the initial third subpixel signal drives the blue subpixel.

S101, obtaining each first stimulus value signal of an initial first sub-pixel signal according to an initial first sub-pixel signal, obtaining each second stimulus value signal of an initial second sub-pixel signal according to an initial second sub-pixel signal, and obtaining each third stimulus value signal of an initial third sub-pixel signal according to an initial third sub-pixel signal;

the pixel signal includes three sub-pixel signals, namely, an initial first sub-pixel signal, an initial second sub-pixel signal, and an initial third sub-pixel signal. Wherein, each sub-pixel signal corresponds to a stimulus value signal according to the optical brightness. It should be noted that one sub-pixel signal may correspond to a plurality of stimulus value signals. Specifically, a type of stimulus value signal corresponding to the initial first sub-pixel signal is a first stimulus value signal, a type of stimulus value signal corresponding to the initial second sub-pixel signal is a second stimulus value signal, and a type of stimulus value signal corresponding to the initial third sub-pixel signal is a third stimulus value signal.

Correspondingly, the process of obtaining each first stimulus value signal of the initial first sub-pixel signal according to the initial first sub-pixel signal is as follows:

wherein the maximum value of the pixel signal depends on the type of the displayed image, and the pixel signal is taken as an example for displaying an 8-bit gray imageMaximum number 2⁸-1＝255。

In one example, fig. 3 is a flow chart of a pixel signal conversion method according to another embodiment, as shown in fig. 3, a process of determining a gain value according to a maximum value and a minimum value in a stimulation value signal set in step S101 includes step S200:

s200, when the maximum value is larger than N times of the minimum value, determining a gain value according to the ratio of the maximum value to the signal difference value, otherwise, setting a preset gain value as the gain value; wherein the signal difference is a ratio of the maximum value to the minimum value.

Let max be the maximum value and min be the minimum value. That is, when max > N × min, the gain value G ═ K × max/(max-min) + a, where a is a constant and K is a proportionality coefficient. When max < N min, the gain value is a preset gain value. Generally, as a preferred embodiment, the preset gain value is 2.

Wherein, as above, the first stimulus value signal comprises RX, RY and RZ. And performing gain processing on the first stimulus value signal, taking the preset gain value as 2 as an example, and enabling the gain-processed first stimulus value signal to be twice as large as the original stimulus value signal, namely 2RX, 2RY and 2 RZ. Similarly, the second stimulus value signals after the double gain processing are 2GX, 2GY and 2 GZ; the third stimulus value signals after the double gain processing are 2BX, 2BY and 2 BZ. It is essential that the preset gain value includes, but is not limited to, 2.

S102, determining a gain value according to the maximum value and the minimum value in the stimulation value signal set, and respectively performing gain processing on the first stimulation value signal, the second stimulation value signal and the third stimulation value signal according to the gain value; wherein the set of stimulus value signals includes a first stimulus value signal, a second stimulus value signal, and a third stimulus value signal;

in one embodiment, the set of stimulus value signals includes a RY stimulus value signal, a GY stimulus value signal, and a BY stimulus value signal.

Assuming that the stimulus value signal set is U1, U1 is (RY, GY, BY). Fig. 4 is a graph illustrating an aggregate of stimulus value signals according to an embodiment, where the horizontal axis represents sub-pixel signals and the vertical axis represents stimulus value signals, as shown in fig. 4. The variation of the stimulus value signals from the set of stimulus value signals with sub-pixel signals is characterized as shown in fig. 3. The minimum Min1 and the maximum Max1 in the stimulation value signal set are Min (RY, GY, BY) and Max (RY, GY, BY). Note that after the double gain processing, U1 is (2RY, 2GY, 2BY).

In one embodiment, the set of stimulus value signals includes an RX stimulus value signal, a GY stimulus value signal, and a BZ stimulus value signal.

Assuming that the stimulus value signal set is U2, U2 is (RX, GY, BZ) and the maximum value Max2 is Max (RX, GY, BZ). Note that after the double gain processing, U2 is (2RX, 2GY, 2 BZ).

Fig. 5 is a graph illustrating an aggregate of stimulus value signals according to another embodiment, and as shown in fig. 5, the horizontal axis represents sub-pixel signals and the vertical axis represents stimulus value signals. The variation of the stimulus value signals in the set of stimulus value signals with sub-pixel signals is characterized as shown in fig. 4. As shown in fig. 4, the stimulus value signal set U2 is closer to the stimulus value signal set U1 in proportion to the stimulus value signal set U2, so that the sub-pixel signals after the subsequent conversion can be closer to the actual expression of the mixed color of the original R, G, B.

Wherein the minimum Min2 in the set of gain-processed stimulus value signals is Min (2RX, 2GY, 2 BZ).

S103, obtaining a fourth sub-pixel signal according to the minimum value in the stimulation value signal set after the gain processing;

fig. 6 is a flowchart of a pixel signal conversion method according to yet another embodiment, and as shown in fig. 6, the process of obtaining a fourth sub-pixel signal according to the minimum value in the stimulation value signal set after the gain processing in step S103 includes step S300:

and S300, assigning any fourth stimulation value signal as a minimum value according to the relationship between the fourth sub-pixel signal and any fourth stimulation value signal of the fourth sub-pixel signal to obtain a fourth sub-pixel signal.

Correspondingly, the fourth sub-pixel signal also includes a WX stimulus value signal, a WY stimulus value signal, or a WZ stimulus value signal. The relationship between the fourth sub-pixel signal and each corresponding stimulus value signal is as follows:

wherein WX is a WX stimulation value signal, WY is a WY stimulation value signal, WZ is a WZ stimulation value signal, and W is a fourth sub-pixel signal; t is the pixel signal maximum. γ WX, γ WY, and γ WZ are all stimulation value power functions of the fourth sub-pixel signal.

Correspondingly, after determining the stimulus value signal of the fourth sub-pixel signal, the fourth sub-pixel signal is obtained as follows:

In one embodiment, any of the fourth stimulus value signals is a WY stimulus value signal.

S104, obtaining a first conversion sub-pixel signal according to the difference value between the first stimulation value signal after any gain processing and the minimum value, obtaining a second conversion sub-pixel signal according to the difference value between the second stimulation value signal after any gain processing and the minimum value, and obtaining a third conversion sub-pixel signal according to the difference value between the third stimulation value signal after any gain processing and the minimum value.

Taking any one of the first gain-processed stimulus value signals RY' ═ G × RY stimulus value signals as an example, the first subpixel signal is converted as follows:

wherein the content of the first and second substances,

to convert the first subpixel signal, min is the minimum value and γ RX is the stimulus value power function of the original first subpixel signal.

Similarly, the second subpixel signal can be converted and the third subpixel signal can be converted.

S105, converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal to be used as converted pixel signals; the converted pixel signals are used for correspondingly driving a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel in a specific pixel unit.

The converted pixel signals comprise a first sub-pixel signal, a second sub-pixel signal, a third sub-pixel signal and a fourth sub-pixel signal. Correspondingly, as shown in fig. 2, the first sub-pixel signal is switched to drive the red sub-pixel, the second sub-pixel signal is switched to drive the green sub-pixel, the third sub-pixel signal is switched to drive the blue sub-pixel, and the fourth sub-pixel signal is switched to drive the white sub-pixel.

According to the pixel signal conversion method, the corresponding first stimulus value signal, second stimulus value signal and third stimulus value signal are obtained according to the initial first sub-pixel signal, the initial second sub-pixel signal and the initial third sub-pixel signal in the pixel signals. And further, performing gain processing on the first stimulus value signal, the second stimulus value signal and the third stimulus value signal according to the maximum value and the minimum value in the stimulus value signal set, obtaining a fourth sub-pixel signal according to the minimum value of the stimulus value signals after the gain processing, and sequentially obtaining a converted first sub-pixel signal, a converted second sub-pixel signal and a converted third sub-pixel signal. And finally, converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal to be used as converted pixel signals. Therefore, when the converted pixel signals are applied to a color-mixed color display formed by W, R, G, B four-color sub-pixels, the display effect is closer to the actual expression of the original R, G, B color-mixed color, the defect of large-viewing-angle color cast is reduced, and the display effect is improved.

The application provides a pixel signal conversion device:

fig. 7 is a block diagram of a pixel signal conversion device according to an embodiment, and as shown in fig. 7, the pixel signal conversion device includes blocks 100 to 105:

a pixel signal obtaining module 100, configured to obtain a pixel signal; the pixel signals comprise an initial first sub-pixel signal, an initial second sub-pixel signal and an initial third sub-pixel signal; the pixel signals are used for correspondingly driving a red sub-pixel, a green sub-pixel and a blue sub-pixel in a specific pixel unit;

the signal processing module 101 is configured to obtain each first stimulus value signal of the initial first subpixel signal according to the initial first subpixel signal, obtain each second stimulus value signal of the initial second subpixel signal according to the initial second subpixel signal, and obtain each third stimulus value signal of the initial third subpixel signal according to the initial third subpixel signal;

the gain module 102 is configured to determine a gain value according to a maximum value and a minimum value in the stimulus value signal set, and perform gain processing on the first stimulus value signal, the second stimulus value signal, and the third stimulus value signal according to the gain value; wherein the set of stimulus value signals includes a first stimulus value signal, a second stimulus value signal, and a third stimulus value signal;

in one embodiment, the gain module 102 is specifically configured to determine a gain value according to a ratio of the maximum value to the signal difference value when the maximum value is greater than N times the minimum value, and otherwise, set a preset gain value as the gain value; wherein the signal difference is a ratio of the maximum value to the minimum value.

A white sub-pixel obtaining module 103, configured to obtain a fourth sub-pixel signal according to a minimum value in the set of gain-processed stimulus value signals;

in one embodiment, the white subpixel obtaining module 102 is specifically configured to assign a minimum value to any fourth stimulus value signal according to a relationship between the fourth subpixel signal and any fourth stimulus value signal of the fourth subpixel signal, so as to obtain the fourth subpixel signal;

the conversion sub-pixel obtaining module 104 is configured to obtain a conversion first sub-pixel signal according to a difference between the first stimulus value signal after any gain processing and the minimum value, obtain a conversion second sub-pixel signal according to a difference between the second stimulus value signal after any gain processing and the minimum value, and obtain a conversion third sub-pixel signal according to a difference between the third stimulus value signal after any gain processing and the minimum value.

A signal conversion module 105, configured to convert the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal, and the fourth sub-pixel signal as converted pixel signals; the converted pixel signals are used for correspondingly driving a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel in a specific pixel unit.

The pixel signal conversion device obtains a first stimulus value signal, a second stimulus value signal and a third stimulus value signal according to an initial first sub-pixel signal, an initial second sub-pixel signal and an initial third sub-pixel signal in the pixel signals. And further, performing gain processing on the first stimulus value signal, the second stimulus value signal and the third stimulus value signal according to the maximum value and the minimum value in the stimulus value signal set, obtaining a fourth sub-pixel signal according to the minimum value of the stimulus value signals after the gain processing, and sequentially obtaining a converted first sub-pixel signal, a converted second sub-pixel signal and a converted third sub-pixel signal. And finally, converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal to be used as converted pixel signals. Therefore, when the converted pixel signals are applied to a color-mixed color display formed by W, R, G, B four-color sub-pixels, the display effect is closer to the actual expression of the original R, G, B color-mixed color, the defect of large-viewing-angle color cast is reduced, and the display effect is improved.

In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:

According to the computer equipment, the corresponding first stimulation value signal, the second stimulation value signal and the third stimulation value signal are obtained according to the initial first sub-pixel signal, the initial second sub-pixel signal and the initial third sub-pixel signal in the pixel signals. And further, performing gain processing on the first stimulus value signal, the second stimulus value signal and the third stimulus value signal according to the maximum value and the minimum value in the stimulus value signal set, obtaining a fourth sub-pixel signal according to the minimum value of the stimulus value signals after the gain processing, and sequentially obtaining a converted first sub-pixel signal, a converted second sub-pixel signal and a converted third sub-pixel signal. And finally, converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal to be used as converted pixel signals. Therefore, when the converted pixel signals are applied to a color-mixed color display formed by W, R, G, B four-color sub-pixels, the display effect is closer to the actual expression of the original R, G, B color-mixed color, the defect of large-viewing-angle color cast is reduced, and the display effect is improved.

In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:

The computer-readable storage medium obtains a first stimulus value signal, a second stimulus value signal, and a third stimulus value signal according to the initial first sub-pixel signal, the initial second sub-pixel signal, and the initial third sub-pixel signal in the pixel signals. And further, performing gain processing on the first stimulus value signal, the second stimulus value signal and the third stimulus value signal according to the maximum value and the minimum value in the stimulus value signal set, obtaining a fourth sub-pixel signal according to the minimum value of the stimulus value signals after the gain processing, and sequentially obtaining a converted first sub-pixel signal, a converted second sub-pixel signal and a converted third sub-pixel signal. And finally, converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal to be used as converted pixel signals. Therefore, when the converted pixel signals are applied to a color-mixed color display formed by W, R, G, B four-color sub-pixels, the display effect is closer to the actual expression of the original R, G, B color-mixed color, the defect of large-viewing-angle color cast is reduced, and the display effect is improved.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A pixel signal conversion method, comprising the steps of:

when the maximum value in the stimulus value signal set is larger than N times of the minimum value in the stimulus value signal set, determining a gain value according to a gain value calculation formula, otherwise, setting a preset gain value as the gain value;

the gain value calculation formula is as follows:

G＝K*max/(max-min)+A；

wherein G is a gain value, max is a maximum value, min is a minimum value, A is a constant, and K is a proportionality coefficient;

according to the gain value, respectively carrying out gain processing on the first stimulus value signal, the second stimulus value signal and the third stimulus value signal; wherein the set of stimulus value signals includes one of the first stimulus value signal, one of the second stimulus value signal, and one of the third stimulus value signal;

assigning any fourth stimulation value signal as a minimum value in a stimulation value signal set after gain processing according to the relationship between the fourth sub-pixel signal and any fourth stimulation value signal of the fourth sub-pixel signal so as to obtain the fourth sub-pixel signal;

the difference value between any one of the gain-processed first stimulus value signals and the minimum value is brought into a conversion first sub-pixel signal calculation formula to obtain a conversion first sub-pixel signal, the difference value between any one of the gain-processed second stimulus value signals and the minimum value is brought into a conversion second sub-pixel signal calculation formula to obtain a conversion second sub-pixel signal, and the difference value between any one of the gain-processed third stimulus value signals and the minimum value is brought into a conversion third sub-pixel signal calculation formula to obtain a conversion third sub-pixel signal;

the conversion first sub-pixel signal calculation formula is:

wherein the content of the first and second substances,

for converting the first subpixel signal, min is the minimum value, γ RX is the stimulus value power function of the initial first subpixel signal, RX' ═ G RX;

the calculation formula for converting the second sub-pixel signal is as follows:

wherein the content of the first and second substances,

in order to convert the second sub-pixel signal, min is the minimum value, γ RY is the stimulus value power function of the initial second sub-pixel signal, RY' ═ G × RY;

the calculation formula for converting the third sub-pixel signal is as follows:

wherein the content of the first and second substances,

in order to convert the third sub-pixel signal, min is the minimum value, γ RZ is the stimulus value power function of the initial third sub-pixel signal, RZ ═ G × RZ;

taking the converted first sub-pixel signal, the converted second sub-pixel signal, the converted third sub-pixel signal and the fourth sub-pixel signal as converted pixel signals; the converted pixel signals are used for correspondingly driving the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the specific pixel unit.

2. The pixel signal conversion method according to claim 1, wherein the fourth stimulus value signal is a WX stimulus value signal, a WY stimulus value signal, or a WZ stimulus value signal;

any of the fourth stimulus value signals is the WY stimulus value signal.

3. The pixel signal conversion method according to claim 1, wherein the first stimulus value signal is an RX stimulus value signal, a RY stimulus value signal, or an RZ stimulus value signal;

the second stimulus value signal is a GX stimulus value signal, a GY stimulus value signal or a GZ stimulus value signal;

the third stimulation value signal is a BX stimulation value signal, a BY stimulation value signal or a BZ stimulation value signal.

4. The pixel signal conversion method according to claim 3, wherein the set of gain-processed stimulus value signals includes the gain-processed RY stimulus value signal, the gain-processed GY stimulus value signal, and the gain-processed BY stimulus value signal.

5. The pixel signal conversion method according to claim 3, wherein the set of gain-processed stimulus value signals includes the gain-processed RX stimulus value signal, the gain-processed GY stimulus value signal, and the gain-processed BZ stimulus value signal.

6. The pixel signal converting method according to claim 3, wherein the process of obtaining each first stimulus value signal of the initial first sub-pixel signal according to the initial first sub-pixel signal is as follows:

the process of obtaining each second stimulus value signal of the initial second sub-pixel signal according to the initial second sub-pixel signal is as follows:

the process of obtaining each third stimulus value signal of the initial third sub-pixel signal according to the initial third sub-pixel signal is as follows:

wherein, RX is the RX stimulus value signal, RY is the RY stimulus value signal, RZ is the RZ stimulus value signal, and R is the initial first sub-pixel signal; GX is the GX stimulus value signal, GY is the GY stimulus value signal, GZ is the GZ stimulus value signal, and G is the initial second sub-pixel signal; BX is the BX stimulus value signal, BY is the BY stimulus value signal, BZ is the BZ stimulus value signal, and B is the initial third subpixel signal; t is the maximum value of the pixel signal, and the maximum value of the pixel signal is determined according to the type of a display image of the pixel signal;

7. A pixel signal conversion apparatus, comprising:

a signal processing module, configured to obtain each first stimulus value signal of the initial first subpixel signal according to the initial first subpixel signal, obtain each second stimulus value signal of the initial second subpixel signal according to the initial second subpixel signal, and obtain each third stimulus value signal of the initial third subpixel signal according to the initial third subpixel signal;

the gain module is used for determining a gain value according to the maximum value and the minimum value in the stimulation value signal set, when the maximum value is larger than N times of the minimum value, the gain value is determined according to a gain value calculation formula, and otherwise, a preset gain value is set as the gain value;

the gain value calculation formula is as follows:

G＝K*max/(max-min)+A；

wherein G is a gain value, max is a maximum value, min is a minimum value, A is a constant, and K is a proportionality coefficient; respectively performing gain processing on the first stimulus value signal, the second stimulus value signal and the third stimulus value signal according to the gain value; wherein the set of stimulus value signals includes one of the first stimulus value signal, one of the second stimulus value signal, and one of the third stimulus value signal;

a white subpixel obtaining module, configured to assign a fourth stimulus value signal to a minimum value in a stimulus value signal set after gain processing according to a relationship between the fourth subpixel signal and the fourth stimulus value signal of the fourth subpixel signal, so as to obtain the fourth subpixel signal;

a conversion sub-pixel obtaining module, configured to obtain a conversion first sub-pixel signal by substituting a difference between any one of the gain-processed first stimulus value signals and the minimum value into a conversion first sub-pixel signal calculation formula, obtain a conversion second sub-pixel signal by substituting a difference between any one of the gain-processed second stimulus value signals and the minimum value into a conversion second sub-pixel signal calculation formula, and obtain a conversion third sub-pixel signal by substituting a difference between any one of the gain-processed third stimulus value signals and the minimum value into a conversion third sub-pixel signal calculation formula;

the conversion first sub-pixel signal calculation formula is:

wherein the content of the first and second substances,

wherein the content of the first and second substances,

wherein the content of the first and second substances,

the signal conversion module is used for converting the first sub-pixel signal, the second sub-pixel signal, the third sub-pixel signal and the fourth sub-pixel signal into converted pixel signals; the converted pixel signals are used for correspondingly driving the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel in the specific pixel unit.

8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the pixel signal conversion method according to any one of claims 1 to 6 when executing the computer program.